"Battle to the Death" was remastered for the 3D remakes and released as "Last Battle." However, two versions of the theme's intro were added to be used in cutscenes featuring the Cloud of Darkness, while "Last Battle -3-" is the theme used in the battle against the entity. "Last Battle -1-" to "Last Battle -3-" are the fifty-fourth to fifty-sixth tracks of the original soundtrack.

A rearranged version of "Battle to the Death" titled "The Reach of Darkness" plays during the battle against the Cloud of Darkness as she appears as the final boss of the Crystal Tower storyline. It was composed by Masayoshi Soken.

"This Is the Last Battle -arrange- from FINAL FANTASY III" appears as a battle theme. It can be selected automatically for battles taking place at the World of Darkness and the new Crystal Tower arena, or including Onion Knight or Cloud of Darkness.

"Battle to the Death" is the first true final boss theme in the series, as the original Final Fantasy only used a regular random encounter theme for Chaos, and the original Final Fantasy II used the regular boss theme for the Emperor. Remakes of Final Fantasy gave Chaos his own final boss theme, whereas Final Fantasy II had new boss themes and established the boss theme used in the original as the Emperor's final boss theme.